Yesterday I was browsing Reddit and I saw this: http://i.imgur.com/uN9V3Zth.jpg Any info regarding the Power Glove? I never know the N64 had one. How much is it? What's it's back story? When was it release? What games are compatible with it?

It's just a strange third-party controller (and definitely unlicensed, so nothing was specifically designed for it). I believe there was a PS1 version as well (or at least it was announced).
Somewhere I have an old Game Informer from 1998 that reviewed it. Something like $90, but they said go buy a couple good games instead.
From what I remember they said, it's what it looks like: a brace you stick your hand in to reach the buttons and move your arm around for directions.